Effect of different PET bottles on the quality of 100% orange juice

Polyethylene terephthalate(PET) has many merits,such as chemical stable,light,cheap,etc.,and has been widely applied in soft drink industry. However,the gas permeability of PET is still inferior to that of glass. Improving the gas barrier property of PET and the quality of juice beverages is a major purpose of this project. An experiment for determining vitamin C and color difference of 100% orange juice,which was packaged in four different PET bottles(one layer PET bottle,multilayer PET bottle,oxygen absorbent added PET bottle,and inner coating PET bottle) and stored at three temperature levels(4,20,37℃),was carried out. The protective effects of four PET bottles on the concentration of vitamin C and color were topped by multilayer PET bottle,followed by inner coating PET bottle,and then oxygen absorbent added PET bottle. The least protective package was single layer PET bottle. The results also recommended the juice products should be stored at 4℃.